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Название: Proton and Oxygen-Ion Conductivities of Hexagonal Perovskite Ba5In2Al2ZrO13
Авторы: Andreev, R.
Korona, D.
Anokhina, I.
Animitsa, I.
Дата публикации: 2022
Библиографическое описание: Proton and Oxygen-Ion Conductivities of Hexagonal Perovskite Ba5In2Al2ZrO13 / R. Andreev, D. Korona, I. Anokhina et al. // Materials. — 2022. — Vol. 15. — Iss. 11. — 3944.
Аннотация: The hexagonal perovskite Ba5 In2Al2ZrO13 and In3+-doped phase Ba5 In2.1Al2Zr0.9O12.95 were prepared by the solid-state synthesis method. The introduction of indium in the Zr-sublattice was accompanied by an increase in the unit cell parameters: a = 5.967 Å, c = 24.006 Å vs. a = 5.970 Å, c = 24.011 Å for doped phase (space group of P63 /mmc). Both phases were capable of incorporating water from the gas phase. The ability of water incorporation was due to the presence of oxygen deficient blocks in the structure, and due to the introduction of oxygen vacancies during doping. According to thermogravimetric (TG) measurements the compositions of the hydrated samples corresponded to Ba5 In2Al2ZrO12.7 (OH)0.6 and Ba5 In2.1Al2Zr0.9O12.54 (OH)0.82. The presence of different types of OH−-groups in the structure, which participate in different hydrogen bonds, was confirmed by infrared (IR) investigations. The measurements of bulk conductivity by the impedance spectroscopy method showed that In3+-doping led to an increase in conductivity by 0.5 order of magnitude in wet air (pH2O = 1.92·10−2 atm); in this case, the activation energies decreased from 0.27 to 0.19 eV. The conductivity−pO2 measurements showed that both the phases were dominant proton conductors at T < 500◦C in wet conditions. The composition Ba5 In2.1Al2Zr0.9O12.95 exhibited a proton conductivity ~10−4 S·cm−1 at 500◦C. The analysis of partial (O2−, H+, h•) conductivities of the investigated phases has been carried out. Both phases in dry air (pH2O = 3.5·10−5 atm) showed a mixed (oxygen-ion and hole) type of conductivity. The obtained results indicated that the investigated phases of Ba5 In2Al2ZrO13 and Ba5 In2.1Al2Zr0.9O12.95 might be promising proton-conducting oxides in the future applications in electrochemical devices, such as solid oxide fuel cells. Further modification of the composition and search for the optimal dopant concentrations can improve the H+-conductivity. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
Ключевые слова: HYDRATION
PEROVSKITE HEXAGONAL STRUCTURE
PROTON CONDUCTORS
TRANSPORT PROPERTIES
ACTIVATION ENERGY
ALUMINUM COMPOUNDS
BARIUM COMPOUNDS
HYDRATION
HYDROGEN BONDS
INDIUM COMPOUNDS
IONS
OXYGEN VACANCIES
SPECTROSCOPIC ANALYSIS
ZIRCONIUM COMPOUNDS
DOPED PHASIS
HEXAGONAL PEROVSKITE
HEXAGONAL STRUCTURES
OXYGEN-ION CONDUCTIVITY
PEROVSKITE HEXAGONAL STRUCTURE
PHASE SPACES
PROTON CONDUCTORS
SOLID STATE SYNTHESIS METHOD
SUB-LATTICES
UNIT CELL PARAMETERS
PEROVSKITE
URI: http://elar.urfu.ru/handle/10995/117918
Условия доступа: info:eu-repo/semantics/openAccess
Идентификатор SCOPUS: 85131798521
Идентификатор WOS: 000808718600001
Идентификатор PURE: 30540583
DOI: 10.3390/ma15113944
Сведения о поддержке: Russian Science Foundation, RSF: 22-23-20003
Funding: This research was supported by the Russian Science Foundation and Government of Sverdlovsk region, Joint Grant 22-23-20003 https://rscf.ru/en/project/22-23-20003/.
Карточка проекта РНФ: 22-23-20003
Располагается в коллекциях:Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC

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